docs: def _resize_blob(self, ud, size):
          # type: (Uploader, blobxfer.models.upload.Descriptor, int) -> None
          """Resize page blob
          :param Uploader self: this
          :param blobxfer.models.upload.Descriptor ud: upload descriptor
          :param int size: content length
          """
          blobxfer.operations.azure.blob.page.resize_blob(ud.entity, size)
          if blobxfer.util.is_not_empty(ud.entity.replica_targets):
              for ase in ud.entity.replica_targets:
                  blobxfer.operations.azure.blob.page.resize_blob(ase, size)